Method of changing an air filter of vehicle air conditioning system

Abstract

A method of signaling for a change of an air filter of a vehicle air conditioning system is disclosed. The present invention uses a sensor installed in a conventional air conditioner and the appropriate time for changing the air filter is determined by checking compressor operation when a degree of airflow is decreased during air conditioner operation.

What is claimed is:  
     
       1. A method for signaling a change of an air filter for an air conditioning system of a vehicle, comprising: 
       turning on an air conditioner and setting a blower at a maximum level to set a passenger compartment temperature at a lowest temperature of the air conditioner;  
       sensing the presence of at least one signaling condition; and  
       signaling a need for a new air filter when an air conditioner compressor cycles five times or more and at least one said signaling condition is present.  
     
     
       2. The method as claimed in  claim 1 , wherein said signaling conditions include an ambient temperature of 30° C. or higher, the air conditioner operated at least for 10 mm, and an average compartment temperature of 25° C. or higher. 
     
     
       3. The method as claimed in  claim 2 , wherein the ambient temperature, the operation time period of the air conditioner, and the average compartment temperature are set according to a type of the vehicle, respectively. 
     
     
       4. The method as claimed in  claim 2 , wherein said signaling occurs when all said signaling conditions are sensed. 
     
     
       5. The method as claimed in  claim 1 , wherein said signaling comprises automatically turning on a lamp.